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1.
The ability for a total cunt to act friendly around people, such as her boyfriend's friends. Very possibly related to the succubus.
Man, she seems really friendly, but I think she's really good at cunt masking, Larry is always complaining about her.
by torerodrizzle November 20, 2009
 
2.
the act of a woman sitting on your face
Guy: Damn bitch I almost suffocated last night during that cunt masking

Girl: I told you two taps on my ass if you wanted to stop

Guy: Don't worry, I'll use a snorkel next time
by Casey T. DJ homie dangerous October 22, 2007